You can take a good picture of anything. A bad one, too... I want to make a picture that could stand on its own, regardless of what it was a picture of. I've never been a bit interested in the fact that this was a picture of a blues musician or a street corner or something.
Notes from Wikiquote
Earlier William Eggleston attributed the first saying You can take a good picture of anything to Garry Winogrand in a conversation with him. Source: HORSES & DOGS PB, 1994. p. 5